PHP警告：array_filter（）期望参数2是有效的回调，第二个数组成员不是有效的方法

Question

我最初有一个大数组，我从数据库中得到了一个简短的版本：

$arreglo =Array
(
    "0" => Array
        (
            "concurso" => 2600,
            "R1" => 1
        ),

    "1" => Array
        (
            "concurso" => 2602,
            "R1" => 1
        ),

    "2" => Array
        (
            "concurso" => 2603,
            "R1" => 1
        ),

    "3" => Array
        (
            "concurso" => 2648,
            "R1" => 1
        ),

    "4" => Array
        (
            "concurso" => 2653,
            "R1" => 1
        ),

    "5" => Array
        (
            "concurso" => 2655,
            "R1" => 1
        ),

    "6" => Array
        (
            "concurso" => 2698,
            "R1" => 1
        ),

    "7" => Array
        (
            "concurso" => 2722,
            "R1" => 1
        ),

    "8" => Array
        (
            "concurso" => 2741,
            "R1" => 1
        ),

    "9" => Array
        (
            "concurso" => 2743,
            "R1" => 1
        ),

    "10" => Array
        (
            "concurso" => 2744,
            "R1" => 1
        ),

    "11" => Array
        (
            "concurso" => 2745,
            "R1" => 1
        ),

    "12" => Array
        (
            "concurso" => 2763,
            "R1" => 1
        ),

    "13" => Array
        (
            "concurso" => 2778,
            "R1" => 1
        ),

    "14" => Array
        (
            "concurso" => 2780,
            "R1" => 1
        ),

    "15" => Array
        (
            "concurso" => 2782,
            "R1" => 1
        ),

    "16" => Array
        (
            "concurso" => 2607,
            "R1" => 2
        ),

    "17" => Array
        (
            "concurso" => 2609,
            "R1" => 2
        )
);

一直进行到“ R1”元素值为56。

因此，我想分离R1的每组值，例如，仅当R1等于1时，我通过使用以下函数将每个“ concurso”的值存储在一个名为“ $ concursos”的数组中：

function category($var)
{
    return (is_array($var) && $var['R1'] == 1);
}
$current=array_filter($arreglo,"category");

到现在为止一切正常，因为当R1 = 1时，我仅在R1 = 1时获得该列表，如下所示：

Array
(
    [0] => 2600
    [1] => 2602
    [2] => 2603
    [3] => 2648
    [4] => 2653
    [5] => 2655
    [6] => 2698
    [7] => 2722
    [8] => 2741
    [9] => 2743
    [10] => 2744
    [11] => 2745
    [12] => 2763
    [13] => 2778
    [14] => 2780
    [15] => 2782
)

问题是，如果我想再次在for循环中使用以下数字（其中R1 = 2,3，... 56）来进行此操作，则无需指定== 1，而是将== $ currentR1设置为像这样的功能：

function category($var)
    {
        return (is_array($var) && $var['R1'] == $currentR1);
    }
    $current=array_filter($arreglo,"category");

现在的问题是，如果我尝试输入参数，则函数调用失败，如何在此处指定参数？

例如，我尝试过

$current=array_filter($repeticiones,array('category',$l));

它无法警告我

警告：array_filter（）期望参数2是有效的回调，第二个数组成员在X行的myScript.php中不是有效的方法

那我该如何指定参数呢？

Answer 1

您可以使用如下匿名函数：

$r = 2;
$current = array_filter($arreglo, function($var) use ($r){
                                                 // ^ import variable to the closure scope
    return (is_array($var) && $var['R1'] == $r);
});